Final answer:
The "keep constrained corners" option in a sketch fillet manager maintains the original geometric constraints of a corner after a fillet is applied, ensuring that aspects like tangency or perpendicularity are preserved during design changes in CAD software.
Step-by-step explanation:
The "keep constrained corners" option in the sketch fillet manager of computer-aided design (CAD) software ensures that when you apply a fillet to a corner where two lines meet at an angle, the original corner's constraints are maintained after the fillet is applied.
This is useful in maintaining the geometric relationships that have been defined for the corner, such as tangency or perpendicularity, which might be crucial for the design intent.
For instance, in a parametric CAD system where dimensions and constraints define the shape of parts, keeping these constraints ensures that the part updates correctly when changes are made to other dimensions or features.